Arm pin structure and crane

Abstract

The utility model discloses an arm pin structure and crane relates to engineering machinery technical field, wherein arm pin structure includes arm pin shaft subassembly, press pin bolt subassembly, pull pin bolt, straight pin shaft subassembly and first elastic piece, arm pin shaft subassembly and arm tail structure slide fit, arm pin shaft subassembly and pull pin bolt are connected, and the straight pin shaft subassembly and arm tail structure slide fit. A cavity for containing the first elastic piece is formed between the arm pin shaft assembly and the pin pulling bolt and communicates with the communicating hole, and the first elastic piece provides upward force for the pin pressing bolt assembly. According to the technical scheme, the first elastic piece is adopted to provide upward force for the pin pressing bolt assembly, so that the pin pressing bolt assembly cannot sink due to vibration and self weight, the position of the pin pressing bolt assembly can be kept fixed or move upwards, the arm pin shaft assembly and the pin pulling bolt can return to the original positions when released, and the pin pulling effect is improved. The safety and reliability of the cargo boom are effectively improved, the scheme is economical and effective, disassembly and assembly are convenient, and the use convenience of the boom pin structure is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of construction machinery, in particular to a boom pin structure and a crane. Background Art

[0002] A crane is an essential mechanical equipment for the construction of infrastructure, wind power, nuclear power, etc. In particular, wheeled cranes have developed rapidly due to their advantages in cross-country performance and operation performance. The boom is a key component of the crane, and the boom pin, as a connecting part between adjacent boom sections, plays an absolute role in the reliability of the boom. In order to meet the installation and disassembly of the boom sections, the existing boom pin assembly generally presses the boom pin with a press pin bolt to realize the installation and disassembly of the boom sections. The boom pin assembly is divided into two types: the front and rear press pin type boom pin assembly and the middle press pin type boom pin assembly.

[0003] At present, although the middle press boom pin type boom pin assembly used in the boom has advantages compared with the front and rear press pin type boom pin assembly, during the normal telescopic boom process, due to vibration, the self-press pin bolt will sink, resulting in the phenomenon that the boom pin is not released in place or the boom pin screw sinks and collides with the oil cylinder, reducing the reliability of the boom.

[0004] Therefore, how to prevent the press pin bolt from sinking during vibration is an urgent problem to be solved at present. Summary of the Utility Model

[0005] The main purpose of the utility model is to propose a boom pin structure and a crane, aiming to solve the problem of how to prevent the press pin bolt from sinking during vibration.

[0006] To achieve the above purpose, the utility model proposes a boom pin structure applied to a boom. The boom includes at least two boom sections nested with each other. Among them, a boom tail structure is provided on the tail of the inserted boom section in each two adjacent boom sections, and a boom pin cover is provided on the outer boom section of each two adjacent boom sections. The boom pin structure includes a boom pin shaft assembly, a press pin bolt assembly, a pull pin bolt, a straight pin shaft assembly, and a first elastic member. The boom pin shaft assembly is slidably matched with the boom tail structure. The top of the boom pin shaft assembly can extend into the lock pin hole of the boom pin cover. The boom pin shaft assembly is connected to the pull pin bolt. A groove is provided on the boom pin shaft assembly, and a communication hole is provided on the bottom wall of the groove. The straight pin shaft assembly is connected to the boom tail structure. The head of the press pin bolt assembly can abut against the bottom wall of the groove. The screw of the press pin bolt assembly passes through the communication hole and is threadedly connected to the straight pin shaft assembly. A cavity for accommodating the first elastic member is formed between the boom pin shaft assembly and the pull pin bolt, and the cavity is communicated with the communication hole. The first elastic member provides an upward force for the press pin bolt assembly.

[0007] In one embodiment, the upward force provided by the first elastic member is greater than the gravity of the pin bolt assembly.

[0008] In one embodiment, the first elastic member includes a first spring. The first spring is located within the cavity and provides an upward force for the pin bolt assembly.

[0009] In one embodiment, the extraction bolt is provided with a mounting hole for accommodating at least a part of the body of the first spring. The mounting hole communicates with the communication hole. One end of the first spring is connected to the bottom wall of the mounting hole, and the other end of the first spring is connected to the pin bolt assembly.

[0010] In one embodiment, the extraction bolt is provided with an external thread, and the inner wall of the communication hole is provided with an internal thread that mates with the external thread.

[0011] In one embodiment, the direct pin shaft assembly includes a direct pin shaft, a second elastic member, a spring seat, and an arm pin seat. The second elastic member and the spring seat are both sleeved around the arm pin shaft assembly. The arm pin shaft assembly is provided with a boss. Two ends of the second elastic member respectively abut against the boss and the spring seat. The second elastic member is used to drive the top of the arm pin shaft assembly to extend into the lock pin hole. The spring seat is connected to the arm tail structure through the arm pin seat. The spring seat is in sliding fit with the arm pin shaft assembly. The direct pin shaft is connected to the spring seat. The screw of the pin bolt assembly passes through the communication hole and is threadedly connected to the direct pin shaft.

[0012] In one embodiment, the arm pin shaft assembly includes an arm pin shaft and a pressing plate. The pressing plate is installed on the top of the arm tail structure. The arm pin shaft includes an arm pin shaft body and a boss provided on the upper part of the arm pin shaft body. The arm pin shaft body is in sliding fit with the pressing plate. The boss can abut against the pressing plate. The top of the arm pin shaft body can extend into the lock pin hole. The arm pin shaft body is connected to the extraction bolt. The groove is provided on the arm pin shaft body. A cavity is formed between the arm pin shaft body and the extraction bolt.

[0013] In one embodiment, the arm pin shaft assembly further includes an anti-rotation pin. A strip-shaped groove is formed on the outer wall of the arm pin shaft body along a first direction. A limiting hole is provided at a position corresponding to the strip-shaped groove on the pressing plate. The anti-rotation pin is inserted into the strip-shaped groove from the limiting hole to achieve circumferential positioning of the arm pin shaft body.

[0014] In one embodiment, the pin bolt assembly includes a pin bolt and a nut. The head of the pin bolt can abut against the bottom wall of the groove. The screw of the pin bolt passes through the communication hole and is threadedly connected to the direct pin shaft assembly and the nut in sequence.

[0015] In addition, the present utility model also provides a crane, which includes a boom and the arm pin structure described in any of the above technical solutions.

[0016] In an embodiment of the present utility model, during the telescoping process of the boom, the telescopic cylinder extends and drives the pin-pulling bolt to pull downward. The pin-pulling bolt drives the arm pin shaft assembly to slide downward relative to the arm tail structure and the direct pin shaft assembly. At this time, the head of the pin-pressing bolt assembly is separated from the bottom wall of the groove, and the screw of the pin-pressing bolt is threadedly connected to the direct pin shaft assembly and abuts against the first elastic member. The first elastic member can provide an upward force for the pin-pressing bolt assembly, so that the pin-pressing bolt assembly cannot sink due to vibration and its own weight. Thus, the position of the pin-pressing bolt assembly can be kept fixed or move upward. When the arm pin shaft assembly and the pin-pulling bolt are released, they can both return to their original positions. The top of the arm pin shaft assembly can accurately extend into the locking pin hole of the arm pin cover, connecting the inserted arm section and the outer sleeve arm section. There will be no problem of stroke interference between the pin-pulling bolt and the telescopic cylinder, which may cause the telescopic cylinder to be damaged. This effectively improves the safety and reliability of the boom. In the embodiment of the present utility model, by using the first elastic member to provide an upward force for the pin-pressing bolt assembly, the pin-pressing bolt assembly cannot sink due to vibration and its own weight, so that the position of the pin-pressing bolt assembly can be kept fixed or move upward. When the arm pin shaft assembly and the pin-pulling bolt are released, they can both return to their original positions, effectively improving the safety and reliability of the boom. And compared with the prior art, there is no need to change the structure of the arm pin shaft assembly. Only by setting the first elastic member in the cavity can the problem of the pin-pressing bolt assembly sinking due to vibration be solved. The solution is economical and effective, with a simple structure and convenient disassembly and assembly, greatly improving the convenience of using the arm pin structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0018] Figure 1 It is a schematic structural diagram of an embodiment of the crane of the present utility model;

[0019] Figure 2 It is a schematic structural diagram of an embodiment of the boom of the present utility model;

[0020] Figure 3 It is a schematic structural diagram of an embodiment of the telescoping process of the arm pin structure of the present utility model;

[0021] Figure 4Another perspective structural schematic diagram of the telescoping process of the arm pin structure of the present utility model;

[0022] Figure 5 Structural schematic diagram of an embodiment of the arm pin structure of the present utility model;

[0023] Figure 6 Another perspective structural schematic diagram of an embodiment of the arm pin structure of the present utility model.

[0024] Explanation of the reference numerals in the drawings:

[0025] 100, arm pin structure; 1, arm pin shaft assembly; 11, arm pin shaft; 111, arm pin shaft body; 1111, groove; 1112, communication hole; 1113, strip groove; 112, boss; 12, cavity; 13, pressing plate; 131, limiting hole; 14, anti-rotation pin; 15, clamping plate; 2, pin pressing bolt assembly; 21, pin pressing bolt; 22, nut; 3, pin pulling bolt; 31, mounting hole; 32, limiting groove; 4, straight pin shaft assembly; 41, straight pin shaft; 42, second elastic member; 43, spring seat; 44, arm pin seat; 5, first elastic member; 51, first spring;

[0026] 200, crane; 210, boom; 2101, boom section; 2102, boom tail structure; 2103, arm pin cover; 21031, locking pin hole; 220, turntable; 230, counterweight; 240, chassis.

[0027] The realization, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0029] It should be noted that if there are directional indications (such as up, down, left, right, front, back) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, if the embodiments of the present utility model involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0031] Cranes are essential mechanical equipment for the construction of infrastructure, wind power, nuclear power, etc. In particular, wheeled cranes have developed rapidly due to their off-road performance and working performance advantages. The boom is a key component of the crane, and the arm pin, as a connecting part between adjacent boom sections, plays an absolute role in the reliability of the boom. In order to meet the installation and disassembly of the boom sections, the existing arm pin assembly generally presses the arm pin through a press pin bolt to achieve the installation and disassembly of the boom sections. The arm pin assembly is divided into two types: the front and rear press pin type arm pin assembly and the middle press pin type arm pin assembly.

[0032] Currently, although the middle press arm pin type structural arm pin assembly used in the boom has advantages compared with the front and rear press pin type arm pin assembly, during the normal telescoping of the boom, due to vibration, the problem of the self-press pin bolt sinking will occur, resulting in the phenomenon that the arm pin is not released in place or the arm pin screw sinks and collides with the oil cylinder, reducing the reliability of the boom.

[0033] The main objective of the present utility model is to propose an arm pin structure and a crane, aiming to solve the problem of how to prevent the press pin bolt from sinking downward during vibration.

[0034] Please refer to Figures 3 to 6, in an embodiment of the present utility model, the arm pin structure 100 is applied to the boom 210. The boom 210 includes at least two arm sections 2101 nested with each other. Wherein, on the tail of the inserted arm section in every two adjacent arm sections 2101, there is an arm tail structure 2102, and on the outer sleeve arm section of every two adjacent arm sections 2101, there is an arm pin cover 2103. The arm pin structure 100 includes an arm pin shaft assembly 1, a press pin bolt assembly 2, a pull pin bolt 3, a straight pin shaft assembly 4 and a first elastic member 5. The arm pin shaft assembly 1 is slidably matched with the arm tail structure 2102. The top of the arm pin shaft assembly 1 can extend into the lock pin hole 21031 of the arm pin cover 2103. The arm pin shaft assembly 1 is connected with the pull pin bolt 3. There is a groove 1111 on the arm pin shaft assembly 1, and a communication hole 1112 is arranged on the bottom wall of the groove 1111. The straight pin shaft assembly 4 is connected with the arm tail structure 2102. The head of the press pin bolt assembly 2 can abut against the bottom wall of the groove 1111. The screw rod of the press pin bolt assembly 2 passes through the communication hole 1112 and is threadedly connected with the straight pin shaft assembly 4. A cavity 12 for accommodating the first elastic member 5 is formed between the arm pin shaft assembly 1 and the pull pin bolt 3. The cavity 12 is communicated with the communication hole 1112. The first elastic member 5 provides an upward force for the press pin bolt assembly 2.

[0035] In an embodiment of the present utility model, during the telescoping process of the boom 210, the telescopic cylinder extends and drives the pull pin bolt 3 to pull downward. The pull pin bolt 3 drives the arm pin shaft assembly 1 to slide downward relative to the arm tail structure 2102 and the straight pin shaft assembly 4. At this time, the head of the press pin bolt assembly 2 is separated from the bottom wall of the groove 1111. The screw rod of the press pin bolt 21 is threadedly connected with the straight pin shaft assembly 4 and abuts against the first elastic member 5. The first elastic member 5 can provide an upward force for the press pin bolt assembly 2, so that the press pin bolt assembly 2 cannot sink due to vibration and its own weight, thereby enabling the position of the press pin bolt assembly 2 to be fixed or move upward. The arm pin shaft assembly 1 and the pull pin bolt 3 can both return to their original positions when released. The top of the arm pin shaft assembly 1 can accurately extend into the lock pin hole 21031 of the arm pin cover 2103, connecting the inserted arm section 2101 and the outer sleeve arm section 2101. There will be no problem of stroke interference between the pull pin bolt 3 and the telescopic cylinder, resulting in damage to the telescopic cylinder, effectively improving the safety and reliability of the boom 210.

[0036] The technical solution of the present utility model provides an upward force for the pin bolt assembly 2 by using the first elastic member 5, so that the pin bolt assembly 2 cannot sink due to vibration and its own weight, and the position of the pin bolt assembly 2 can be kept fixed or move upward. When the arm pin shaft assembly 1 and the pin pulling bolt 3 are released, they can both return to their original positions, effectively improving the safety and reliability of the boom 210; and compared with the prior art, there is no need to change the structure of the arm pin shaft assembly 1, and setting the first elastic member 5 in the cavity 12 can solve the problem of the pin bolt assembly 2 sinking due to vibration. The solution is economical and effective, with a simple structure, convenient disassembly and assembly, and greatly improves the convenience of using the arm pin structure 100.

[0037] In one embodiment, the upward force provided by the first elastic member 5 is greater than the gravity of the pin bolt assembly 2; specifically, when installing the arm pin structure 100, the first elastic member 5 is provided with a pre-compression amount, and the elastic force generated by the first elastic member 5 on the pin bolt assembly 2 is greater than the gravity of the pin bolt assembly 2, so as to ensure that the pin bolt 21 cannot sink during vibration, and the position of the pin bolt assembly 2 can be kept fixed or move upward. When the arm pin shaft assembly 1 and the pin pulling bolt 3 are released, they can both return to their original positions.

[0038] In one embodiment, the first elastic member 5 includes a first spring 51. The first spring 51 is located in the cavity 12 and provides an upward force for the pin bolt assembly 2; specifically, the first spring 51 is provided with a pre-compression amount, so that the elastic force generated by the first spring 51 on the pin bolt assembly 2 is greater than the gravity of the pin bolt assembly 2. Moreover, the first spring 51 has a simple structure, good elasticity and deformation ability, is convenient to install, has a low cost, and is easy to mass-produce and apply.

[0039] According to an embodiment of the present utility model, the first elastic member 5 includes a disc spring. The number of disc springs is at least one, and at least one disc spring is located in the cavity 12, and the disc spring provides an upward force for the pin bolt assembly 2.

[0040] In one embodiment, the pin pulling bolt 3 is provided with an installation hole 31 for accommodating at least part of the body of the first spring 51. The installation hole 31 communicates with the communication hole 1112. One end of the first spring 51 is connected to the bottom wall of the installation hole 31, and the other end of the first spring 51 is connected to the pin bolt assembly 2; specifically, one end of the first spring 51 extends into the installation hole 31 and is connected to the bottom wall of the installation hole 31, and the other end of the first spring 51 is located in the communication hole 1112 and is connected to the pin bolt assembly 2. The communication hole 1112 and the installation hole 31 together form a cavity 12 for accommodating the first spring 51, and the installation of the first spring 51 is more convenient by setting the installation hole 31.

[0041] According to an embodiment of the present utility model, the first spring 51 is located within the communication hole 1112, and one end of the first spring 51 is connected to the pin-pulling bolt 3, and the other end of the first spring 51 is connected to the pin-pressing bolt assembly 2. That is, one end of the communication hole 1112 close to the pin-pressing bolt assembly 2 is a cavity 12 for accommodating the first spring 51, and the first spring 51 is entirely located within the communication hole 1112.

[0042] According to another embodiment of the present utility model, the pin-pulling bolt 3 is provided with a mounting hole 31 for accommodating the first spring 51. The mounting hole 31 communicates with the communication hole 1112. One end of the first spring 51 is connected to the bottom wall of the mounting hole 31, and the other end of the first spring 51 is connected to the pin-pressing bolt assembly 2. That is, the mounting hole 31 is the cavity 12 for accommodating the first spring 51, and the first spring 51 is entirely located within the mounting hole 31.

[0043] In one embodiment, the pin-pulling bolt 3 is provided with an external thread (not shown in the figure), and the hole wall of the communication hole 1112 is provided with an internal thread (not shown in the figure) that mates with the external thread; specifically, the pin-pulling bolt 3 is threadedly connected to the arm pin shaft assembly 1, with a simple structure, firm connection, and convenient installation and disassembly of the arm pin structure 100.

[0044] In one embodiment, the direct pin shaft assembly 4 includes a direct pin shaft 41, a second elastic member 42, a spring seat 43, and an arm pin seat 44. The second elastic member 42 and the spring seat 43 are both sleeved around the arm pin shaft assembly 1. The arm pin shaft assembly 1 is provided with a boss 112. The two ends of the second elastic member 42 are respectively abutted against the boss 112 and the spring seat 43. The second elastic member 42 is used to drive the top of the arm pin shaft assembly 1 to extend into the lock pin hole 21031. The spring seat 43 is connected to the arm tail structure 2102 through the arm pin seat 44. The spring seat 43 is slidably engaged with the arm pin shaft assembly 1. The direct pin shaft 41 is connected to the spring seat 43. The screw rod of the pin-pressing bolt assembly 2 passes through the communication hole 1112 and is threadedly connected to the direct pin shaft 41; specifically, the arm pin structure 100 is installed and fixed to the arm tail structure 2102 through the arm pin seat 44. The spring seat 43 is sleeved around the arm pin shaft assembly 1 for abutting against the lower end of the second elastic member 42, and the upper end of the second elastic member 42 abuts against the boss 112 on the arm pin shaft assembly 1. During the telescoping process of the boom 210, the telescopic cylinder extends and drives the pin-pulling bolt 3 to pull downward. The pin-pulling bolt 3 drives the arm pin shaft assembly 1 to move downward relative to the arm tail structure 2102 and the spring seat 43. The top of the arm pin shaft assembly 1 moves out of the lock pin hole 21031, and the boss 112 compresses the second elastic member 42. When the arm pin shaft assembly 1 is released, the second elastic member 42 can drive the arm pin shaft assembly 1 to move upward and return to its original position through the boss 112. The top of the arm pin shaft assembly 1 extends into the lock pin hole 21031, and the arm pin shaft assembly 1 drives the pin-pulling bolt 3 to return to its original position, thereby completing the telescoping process of the boom 210.

[0045] In this embodiment, the second elastic member 42 includes a second spring. The second spring is sleeved around the outer periphery of the direct sales shaft assembly 4. Two ends of the second spring are respectively abutted against the boss 112 and the spring seat 43. The second spring is used to drive the top of the arm pin shaft assembly 1 to extend into the lock pin hole 21031. The structure of the second spring is simple, and it has good elasticity and deformation ability. It is convenient to install, has a relatively low cost, and is easy to be mass-produced and applied.

[0046] In this embodiment, the direct sales shaft 41 is detachably connected to the spring seat 43. Specifically, the spring seat 43 is provided with a first through hole and a second through hole which are coaxially arranged. The direct sales shaft 41 passes through the first through hole and the second through hole to realize the connection with the spring seat 43, so that the position of the direct sales shaft 41 is kept fixed, and thus the position of the pin pressing bolt assembly 2 threadedly connected to the direct sales shaft 41 can also be kept relatively fixed.

[0047] In an embodiment, the arm pin shaft assembly 1 includes an arm pin shaft 11 and a pressing plate 13. The pressing plate 13 is installed on the top of the arm tail structure 2102. The arm pin shaft 11 includes an arm pin shaft body 111 and a boss 112 provided on the upper part of the arm pin shaft body 111. The arm pin shaft body 111 is in sliding fit with the pressing plate 13. The boss 112 can be abutted against the pressing plate 13. The top of the arm pin shaft body 111 can extend into the lock pin hole 21031. The arm pin shaft body 111 is connected to the pin pulling bolt 3. A groove 1111 is provided on the arm pin shaft body 111. A cavity 12 is formed between the arm pin shaft body 111 and the pin pulling bolt 3. Specifically, the arm pin shaft assembly 1 realizes the sliding fit with the arm tail structure 2102 through the sliding fit with the pressing plate 13. The pressing plate 13 can be abutted against the upper surface of the boss 112 to limit the upward movement stroke of the arm pin shaft body 111. The second elastic member 42 is abutted against the lower surface of the boss 112 to drive the arm pin shaft body 111 to move upward to restore to the original position.

[0048] In one embodiment, the arm pin shaft assembly 1 further includes an anti-rotation pin 14. A strip-shaped groove 1113 is formed in the outer wall of the arm pin shaft body 111 along a first direction. A limiting hole 131 is formed in the pressing plate 13 corresponding to the position of the strip-shaped groove 1113. The anti-rotation pin 14 is inserted into the strip-shaped groove 1113 through the limiting hole 131 to achieve circumferential positioning of the arm pin shaft body 111. Specifically, the first direction is the up-and-down direction. During the disassembly process of the boom 210, an external force is required to rotate the pin bolt assembly 2 so that the pin bolt assembly 2 moves downward relative to the direct pin shaft assembly 4. Since the head of the pin bolt 21 abuts against the bottom wall of the groove 1111, when the pin bolt assembly 2 rotates, it will drive the arm pin shaft body 111 to move downward together, causing the top of the arm pin shaft body 111 to move out of the locking pin hole 21031, thereby realizing the separation of the inserted arm section 2101 and the outer sleeve arm section 2101. To prevent the arm pin shaft body 111 from rotating together when the pin bolt assembly 2 is rotated by an external force, the installation and fixation of the arm pin shaft 11 and the pressing plate 13 are realized by setting the anti-rotation pin 14, the limiting hole 131, and the strip-shaped groove 1113. Moreover, the strip-shaped groove 1113 extends along the up-and-down direction, which also avoids interference between the arm pin shaft body 111 and the anti-rotation pin 14 when the arm pin shaft body 111 slides relative to the pressing plate 13.

[0049] In one embodiment, the pin bolt assembly 2 includes a pin bolt 21 and a nut 22. The head of the pin bolt 21 can abut against the bottom wall of the groove 1111. The screw of the pin bolt 21 passes through the communication hole 1112 and is threadedly connected to the direct pin shaft assembly 4 and the nut 22 in sequence. Specifically, during the installation process of the boom 210, an external force is required to rotate the pin bolt 21 so that the pin bolt 21 moves upward relative to the direct pin shaft assembly 4, thereby enabling the top of the arm pin shaft body 111 to extend into the locking pin hole 21031 to realize the connection of the inserted arm section 2101 and the outer sleeve arm section 2101. To prevent the pin bolt 21 from slipping out of the communication hole 1112 on the arm pin shaft body 111 during the upward movement, the nut 22 is provided to limit the upward movement stroke of the pin bolt 21. When the pin bolt 21 moves upward until the nut 22 abuts against the direct pin shaft assembly 4, it is the maximum upward movement stroke of the pin bolt 21. Moreover, to prevent the pin bolt 21 and the nut 22 from loosening, the nut 22 can be a self-locking nut. In this embodiment, the elastic force generated by the first spring 51 on the pin bolt assembly 2 is greater than the gravity of the pin bolt 21 and the nut 22.

[0050] In this embodiment, the arm pin shaft assembly 1 further includes a clamping plate 15 that restricts the rotation of the pin removal bolt 3. The clamping plate 15 is connected to the arm pin shaft body 111. A limiting groove 32 is formed along the first direction on the outer wall of the pin removal bolt 3. The clamping plate 15 is inserted into the limiting groove 32 to achieve the circumferential positioning of the pin removal bolt 3. By providing the clamping plate 15, it is ensured that the pin removal bolt 3 will not sink due to vibration during the telescoping process of the boom 210, avoiding the problem that the pin removal bolt 3 interferes with the stroke of the telescopic cylinder due to incomplete release and causing damage to the telescopic cylinder. Moreover, the limiting groove 32 extends in the up and down direction, avoiding interference between the pin removal bolt 3 and the clamping plate 15 during the up and down movement. And for the convenience of disassembly and assembly, the clamping plate 15 and the arm pin shaft body 111 can be detachably connected by bolts.

[0051] Please refer to Figure 1 and Figure 2 , the present utility model also proposes a crane 200, which includes a boom 210 and an arm pin structure 100. The specific structure of the arm pin structure 100 refers to the above embodiment. Since this crane 200 adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one. Among them, in this embodiment, the crane 200 further includes a turntable 220, a counterweight 230, and a chassis 240. The turntable 220 is rotatably connected to the chassis 240, the boom 210 is rotatably connected to the turntable 220, and the counterweight 230 is connected to the chassis 240. The chassis 240 is the support structure of the crane 200, providing a stable foundation and mobility for the crane 200. The turntable 220 supports the boom 210, and the turntable 220 can rotate relative to the chassis 240, so that the boom 210 can operate in multiple directions. The counterweight 230 can increase the lifting capacity and stability of the crane 200 to ensure safe operation. The boom 210 includes at least two arm sections 2101 nested with each other. The specific number of the arm sections 2101 is not limited in this embodiment.

[0052] The above description is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. An arm pin structure, applied to a lifting arm (210), the lifting arm (210) comprising at least two arm sections (2101) nested with each other, wherein an arm tail structure (2102) is provided on the tail of the embedded arm section of every two adjacent arm sections (2101), and an arm pin cover (2103) is provided on the outer arm section of every two adjacent arm sections (2101), characterized in that: The arm pin structure comprises an arm pin shaft assembly (1), a pressure pin bolt assembly (2), a pin puller bolt (3), a straight pin shaft assembly (4) and a first elastic member (5); the arm pin shaft assembly (1) is slidably matched with the arm tail structure (2102); the top of the arm pin shaft assembly (1) can extend into the locking pin hole (21031) of the arm pin cover (2103); the arm pin shaft assembly (1) is connected to the pin puller bolt (3); a groove (1111) is provided on the arm pin shaft assembly (1); a connecting hole (1112) is provided on the bottom wall of the groove (1111); the straight The pin shaft assembly (4) is connected to the arm tail structure (2102), the head of the pin bolt assembly (2) can abut against the bottom wall of the groove (1111), the screw of the pin bolt assembly (2) passes through the connecting hole (1112) and is threadedly connected to the straight pin shaft assembly (4), and a cavity (12) for accommodating the first elastic member (5) is formed between the arm pin shaft assembly (1) and the pin puller bolt (3), and the cavity (12) is connected to the connecting hole (1112), and the first elastic member (5) provides an upward force for the pin bolt assembly (2).

2. The arm pin structure according to claim 1, characterized in that: The upward force provided by the first elastic member (5) is greater than the gravity of the pressing pin bolt assembly (2).

3. The arm pin structure according to claim 1, characterized in that: The first elastic member (5) comprises a first spring (51), the first spring (51) is located in the cavity (12), and the first spring (51) provides an upward force for the pressing pin bolt assembly (2).

4. The arm pin structure according to claim 3, characterized in that: The pull pin bolt (3) is provided with a mounting hole (31) for accommodating at least a portion of the body of the first spring (51); the mounting hole (31) is connected to the connecting hole (1112); one end of the first spring (51) is connected to the bottom wall of the mounting hole (31); and the other end of the first spring (51) is connected to the pressing pin bolt assembly (2).

5. The arm pin structure according to any one of claims 1 to 4, characterized in that: The pin puller bolt (3) is provided with an external thread, and the hole wall of the communicating hole (1112) is provided with an internal thread matching the external thread.

6. The arm pin structure according to any one of claims 1 to 4, characterized in that: The straight pin shaft assembly (4) comprises a straight pin shaft (41), a second elastic member (42), a spring seat (43) and an arm pin seat (44); the second elastic member (42) and the spring seat (43) are both sleeved on the periphery of the arm pin shaft assembly (1); a boss (112) is provided on the arm pin shaft assembly (1); two ends of the second elastic member (42) are respectively in contact with the boss (112) and the spring seat (43); the second elastic member (42) It is used to drive the top of the arm pin shaft assembly (1) to extend into the locking pin hole (21031), the spring seat (43) is connected to the arm tail structure (2102) through the arm pin seat (44), the spring seat (43) is slidably matched with the arm pin shaft assembly (1), the straight pin shaft (41) is connected to the spring seat (43), and the screw of the pressure pin bolt assembly (2) passes through the connecting hole (1112) and is threadedly connected to the straight pin shaft (41).

7. The arm pin structure according to any one of claims 1 to 4, characterized in that: The arm pin shaft assembly (1) comprises an arm pin shaft (11) and a pressure plate (13), wherein the pressure plate (13) is installed on the top of the arm tail structure (2102), the arm pin shaft (11) comprises an arm pin shaft body (111) and a boss (112) arranged on the upper part of the arm pin shaft body (111), the arm pin shaft body (111) is slidably matched with the pressure plate (13), the boss (112) can abut against the pressure plate (13), the top of the arm pin shaft body (111) can extend into the locking pin hole (21031), the arm pin shaft body (111) is connected with the pull pin bolt (3), the groove (1111) is arranged on the arm pin shaft body (111), and the cavity (12) is formed between the arm pin shaft body (111) and the pull pin bolt (3).

8. The arm pin structure according to claim 7, characterized in that: The arm pin shaft assembly (1) further comprises an anti-rotation pin (14); the outer wall of the arm pin shaft body (111) is provided with a strip groove (1113) along a first direction; the pressure plate (13) is provided with a limiting hole (131) at a position corresponding to the strip groove (1113); the anti-rotation pin (14) is inserted into the strip groove (1113) through the limiting hole (131) to achieve circumferential positioning of the arm pin shaft body (111).

9. The arm pin structure according to claim 8, characterized in that: The pin bolt assembly (2) comprises a pin bolt (21) and a nut (22); the head of the pin bolt (21) can abut against the bottom wall of the groove (1111); the screw rod of the pin bolt (21) passes through the connecting hole (1112) and is threadedly connected to the straight pin shaft assembly (4) and the nut (22) in turn.

10. A crane, characterized in that: The crane comprises a jib (210) and a jib pin structure according to any one of claims 1 to 9.

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